gcc/ada/s-valdec.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . V A L _ D E C                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.3 $                              --
  10 --                                                                          --
  11 --   Copyright (C) 1992,1993,1994,1995,1996 Free Software Foundation, Inc.  --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with System.Val_Real; use System.Val_Real;
  37
  38 package body System.Val_Dec is
  39
  40    ------------------
  41    -- Scan_Decimal --
  42    ------------------
  43
  44    --  For decimal types where Size < Integer'Size, it is fine to use
  45    --  the floating-point circuit, since it certainly has sufficient
  46    --  precision for any reasonable hardware, and we just don't support
  47    --  things on junk hardware!
  48
  49    function Scan_Decimal
  50      (Str   : String;
  51       Ptr   : access Integer;
  52       Max   : Integer;
  53       Scale : Integer)
  54       return  Integer
  55    is
  56       Val : Long_Long_Float;
  57
  58    begin
  59       Val := Scan_Real (Str, Ptr, Max);
  60       return Integer (Val * 10.0 ** Scale);
  61    end Scan_Decimal;
  62
  63    -------------------
  64    -- Value_Decimal --
  65    -------------------
  66
  67    --  Again, we use the real circuit for this purpose
  68
  69    function Value_Decimal (Str : String; Scale : Integer) return Integer is
  70    begin
  71       return Integer (Value_Real (Str) * 10.0 ** Scale);
  72    end Value_Decimal;
  73
  74 end System.Val_Dec;